Abstract Despite the well-recognized danger of scolices seeding into the peritoneal cavity or even into the wound as a result of spill occurring during operative removal of a hydatid cyst, the mucosal lining of the bronchial tree appears to resist these scolices which are frequently coughed up when a hydatid of the lung ruptures. Similarly, scolices were seen in large numbers in the urine of a patient whose renal hydatid had ruptured into three calices, and yet there is no evidence of seeding on the urothelium within I5 months of follow-up.